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NAME
INSERT - create new rows in a table
SYNOPSIS
[ WITH [ RECURSIVE ] with_query [, ...] ]
INSERT INTO table_name [ AS alias ] [ ( column_name [, ...] ) ]
{ DEFAULT VALUES | VALUES ( { expression | DEFAULT } [, ...] ) [, ...] | query }
[ ON CONFLICT [ conflict_target ] conflict_action ]
[ RETURNING * | output_expression [ [ AS ] output_name ] [, ...] ]
where conflict_target can be one of:
( { index_column_name | ( index_expression ) } [ COLLATE collation ] [ opclass ] [, ...] ) [ WHERE index_predicate ]
ON CONSTRAINT constraint_name
and conflict_action is one of:
DO NOTHING
DO UPDATE SET { column_name = { expression | DEFAULT } |
( column_name [, ...] ) = ( { expression | DEFAULT } [, ...] ) |
( column_name [, ...] ) = ( sub-SELECT )
} [, ...]
[ WHERE condition ]
DESCRIPTION
INSERT inserts new rows into a table. One can insert one or more rows specified by value
expressions, or zero or more rows resulting from a query.
The target column names can be listed in any order. If no list of column names is given at
all, the default is all the columns of the table in their declared order; or the first N
column names, if there are only N columns supplied by the VALUES clause or query. The
values supplied by the VALUES clause or query are associated with the explicit or implicit
column list left-to-right.
Each column not present in the explicit or implicit column list will be filled with a
default value, either its declared default value or null if there is none.
If the expression for any column is not of the correct data type, automatic type
conversion will be attempted.
ON CONFLICT can be used to specify an alternative action to raising a unique constraint or
exclusion constraint violation error. (See ON CONFLICT Clause below.)
The optional RETURNING clause causes INSERT to compute and return value(s) based on each
row actually inserted (or updated, if an ON CONFLICT DO UPDATE clause was used). This is
primarily useful for obtaining values that were supplied by defaults, such as a serial
sequence number. However, any expression using the table's columns is allowed. The syntax
of the RETURNING list is identical to that of the output list of SELECT. Only rows that
were successfully inserted or updated will be returned. For example, if a row was locked
but not updated because an ON CONFLICT DO UPDATE ... WHERE clause condition was not
satisfied, the row will not be returned.
You must have INSERT privilege on a table in order to insert into it. If ON CONFLICT DO
UPDATE is present, UPDATE privilege on the table is also required.
If a column list is specified, you only need INSERT privilege on the listed columns.
Similarly, when ON CONFLICT DO UPDATE is specified, you only need UPDATE privilege on the
column(s) that are listed to be updated. However, ON CONFLICT DO UPDATE also requires
SELECT privilege on any column whose values are read in the ON CONFLICT DO UPDATE
expressions or condition.
Use of the RETURNING clause requires SELECT privilege on all columns mentioned in
RETURNING. If you use the query clause to insert rows from a query, you of course need to
have SELECT privilege on any table or column used in the query.
PARAMETERS
Inserting
This section covers parameters that may be used when only inserting new rows. Parameters
exclusively used with the ON CONFLICT clause are described separately.
with_query
The WITH clause allows you to specify one or more subqueries that can be referenced by
name in the INSERT query. See Section 7.8, “WITH Queries (Common Table Expressions)”,
in the documentation and SELECT(7) for details.
It is possible for the query (SELECT statement) to also contain a WITH clause. In such
a case both sets of with_query can be referenced within the query, but the second one
takes precedence since it is more closely nested.
table_name
The name (optionally schema-qualified) of an existing table.
alias
A substitute name for table_name. When an alias is provided, it completely hides the
actual name of the table. This is particularly useful when ON CONFLICT DO UPDATE
targets a table named excluded, since that's also the name of the special table
representing rows proposed for insertion.
column_name
The name of a column in the table named by table_name. The column name can be
qualified with a subfield name or array subscript, if needed. (Inserting into only
some fields of a composite column leaves the other fields null.) When referencing a
column with ON CONFLICT DO UPDATE, do not include the table's name in the
specification of a target column. For example, INSERT INTO table_name ... ON CONFLICT
DO UPDATE SET table_name.col = 1 is invalid (this follows the general behavior for
UPDATE).
DEFAULT VALUES
All columns will be filled with their default values.
expression
An expression or value to assign to the corresponding column.
DEFAULT
The corresponding column will be filled with its default value.
query
A query (SELECT statement) that supplies the rows to be inserted. Refer to the
SELECT(7) statement for a description of the syntax.
output_expression
An expression to be computed and returned by the INSERT command after each row is
inserted or updated. The expression can use any column names of the table named by
table_name. Write * to return all columns of the inserted or updated row(s).
output_name
A name to use for a returned column.
ON CONFLICT Clause
The optional ON CONFLICT clause specifies an alternative action to raising a unique
violation or exclusion constraint violation error. For each individual row proposed for
insertion, either the insertion proceeds, or, if an arbiter constraint or index specified
by conflict_target is violated, the alternative conflict_action is taken. ON CONFLICT DO
NOTHING simply avoids inserting a row as its alternative action. ON CONFLICT DO UPDATE
updates the existing row that conflicts with the row proposed for insertion as its
alternative action.
conflict_target can perform unique index inference. When performing inference, it consists
of one or more index_column_name columns and/or index_expression expressions, and an
optional index_predicate. All table_name unique indexes that, without regard to order,
contain exactly the conflict_target-specified columns/expressions are inferred (chosen) as
arbiter indexes. If an index_predicate is specified, it must, as a further requirement for
inference, satisfy arbiter indexes. Note that this means a non-partial unique index (a
unique index without a predicate) will be inferred (and thus used by ON CONFLICT) if such
an index satisfying every other criteria is available. If an attempt at inference is
unsuccessful, an error is raised.
ON CONFLICT DO UPDATE guarantees an atomic INSERT or UPDATE outcome; provided there is no
independent error, one of those two outcomes is guaranteed, even under high concurrency.
This is also known as UPSERT — “UPDATE or INSERT”.
conflict_target
Specifies which conflicts ON CONFLICT takes the alternative action on by choosing
arbiter indexes. Either performs unique index inference, or names a constraint
explicitly. For ON CONFLICT DO NOTHING, it is optional to specify a conflict_target;
when omitted, conflicts with all usable constraints (and unique indexes) are handled.
For ON CONFLICT DO UPDATE, a conflict_target must be provided.
conflict_action
conflict_action specifies an alternative ON CONFLICT action. It can be either DO
NOTHING, or a DO UPDATE clause specifying the exact details of the UPDATE action to be
performed in case of a conflict. The SET and WHERE clauses in ON CONFLICT DO UPDATE
have access to the existing row using the table's name (or an alias), and to rows
proposed for insertion using the special excluded table. SELECT privilege is required
on any column in the target table where corresponding excluded columns are read.
Note that the effects of all per-row BEFORE INSERT triggers are reflected in excluded
values, since those effects may have contributed to the row being excluded from
insertion.
index_column_name
The name of a table_name column. Used to infer arbiter indexes. Follows CREATE INDEX
format. SELECT privilege on index_column_name is required.
index_expression
Similar to index_column_name, but used to infer expressions on table_name columns
appearing within index definitions (not simple columns). Follows CREATE INDEX format.
SELECT privilege on any column appearing within index_expression is required.
collation
When specified, mandates that corresponding index_column_name or index_expression use
a particular collation in order to be matched during inference. Typically this is
omitted, as collations usually do not affect whether or not a constraint violation
occurs. Follows CREATE INDEX format.
opclass
When specified, mandates that corresponding index_column_name or index_expression use
particular operator class in order to be matched during inference. Typically this is
omitted, as the equality semantics are often equivalent across a type's operator
classes anyway, or because it's sufficient to trust that the defined unique indexes
have the pertinent definition of equality. Follows CREATE INDEX format.
index_predicate
Used to allow inference of partial unique indexes. Any indexes that satisfy the
predicate (which need not actually be partial indexes) can be inferred. Follows CREATE
INDEX format. SELECT privilege on any column appearing within index_predicate is
required.
constraint_name
Explicitly specifies an arbiter constraint by name, rather than inferring a constraint
or index.
condition
An expression that returns a value of type boolean. Only rows for which this
expression returns true will be updated, although all rows will be locked when the ON
CONFLICT DO UPDATE action is taken. Note that condition is evaluated last, after a
conflict has been identified as a candidate to update.
Note that exclusion constraints are not supported as arbiters with ON CONFLICT DO UPDATE.
In all cases, only NOT DEFERRABLE constraints and unique indexes are supported as
arbiters.
INSERT with an ON CONFLICT DO UPDATE clause is a “deterministic” statement. This means
that the command will not be allowed to affect any single existing row more than once; a
cardinality violation error will be raised when this situation arises. Rows proposed for
insertion should not duplicate each other in terms of attributes constrained by an arbiter
index or constraint.
Tip
It is often preferable to use unique index inference rather than naming a constraint
directly using ON CONFLICT ON CONSTRAINT
constraint_name. Inference will continue to work correctly when the underlying index
is replaced by another more or less equivalent index in an overlapping way, for
example when using CREATE UNIQUE INDEX ... CONCURRENTLY before dropping the index
being replaced.
OUTPUTS
On successful completion, an INSERT command returns a command tag of the form
INSERT oid count
The count is the number of rows inserted or updated. If count is exactly one, and the
target table has OIDs, then oid is the OID assigned to the inserted row. The single row
must have been inserted rather than updated. Otherwise oid is zero.
If the INSERT command contains a RETURNING clause, the result will be similar to that of a
SELECT statement containing the columns and values defined in the RETURNING list, computed
over the row(s) inserted or updated by the command.
EXAMPLES
Insert a single row into table films:
INSERT INTO films VALUES
('UA502', 'Bananas', 105, '1971-07-13', 'Comedy', '82 minutes');
In this example, the len column is omitted and therefore it will have the default value:
INSERT INTO films (code, title, did, date_prod, kind)
VALUES ('T_601', 'Yojimbo', 106, '1961-06-16', 'Drama');
This example uses the DEFAULT clause for the date columns rather than specifying a value:
INSERT INTO films VALUES
('UA502', 'Bananas', 105, DEFAULT, 'Comedy', '82 minutes');
INSERT INTO films (code, title, did, date_prod, kind)
VALUES ('T_601', 'Yojimbo', 106, DEFAULT, 'Drama');
To insert a row consisting entirely of default values:
INSERT INTO films DEFAULT VALUES;
To insert multiple rows using the multirow VALUES syntax:
INSERT INTO films (code, title, did, date_prod, kind) VALUES
('B6717', 'Tampopo', 110, '1985-02-10', 'Comedy'),
('HG120', 'The Dinner Game', 140, DEFAULT, 'Comedy');
This example inserts some rows into table films from a table tmp_films with the same
column layout as films:
INSERT INTO films SELECT * FROM tmp_films WHERE date_prod < '2004-05-07';
This example inserts into array columns:
-- Create an empty 3x3 gameboard for noughts-and-crosses
INSERT INTO tictactoe (game, board[1:3][1:3])
VALUES (1, '{{" "," "," "},{" "," "," "},{" "," "," "}}');
-- The subscripts in the above example aren't really needed
INSERT INTO tictactoe (game, board)
VALUES (2, '{{X," "," "},{" ",O," "},{" ",X," "}}');
Insert a single row into table distributors, returning the sequence number generated by
the DEFAULT clause:
INSERT INTO distributors (did, dname) VALUES (DEFAULT, 'XYZ Widgets')
RETURNING did;
Increment the sales count of the salesperson who manages the account for Acme Corporation,
and record the whole updated row along with current time in a log table:
WITH upd AS (
UPDATE employees SET sales_count = sales_count + 1 WHERE id =
(SELECT sales_person FROM accounts WHERE name = 'Acme Corporation')
RETURNING *
)
INSERT INTO employees_log SELECT *, current_timestamp FROM upd;
Insert or update new distributors as appropriate. Assumes a unique index has been defined
that constrains values appearing in the did column. Note that the special excluded table
is used to reference values originally proposed for insertion:
INSERT INTO distributors (did, dname)
VALUES (5, 'Gizmo Transglobal'), (6, 'Associated Computing, Inc')
ON CONFLICT (did) DO UPDATE SET dname = EXCLUDED.dname;
Insert a distributor, or do nothing for rows proposed for insertion when an existing,
excluded row (a row with a matching constrained column or columns after before row insert
triggers fire) exists. Example assumes a unique index has been defined that constrains
values appearing in the did column:
INSERT INTO distributors (did, dname) VALUES (7, 'Redline GmbH')
ON CONFLICT (did) DO NOTHING;
Insert or update new distributors as appropriate. Example assumes a unique index has been
defined that constrains values appearing in the did column. WHERE clause is used to limit
the rows actually updated (any existing row not updated will still be locked, though):
-- Don't update existing distributors based in a certain ZIP code
INSERT INTO distributors AS d (did, dname) VALUES (8, 'Anvil Distribution')
ON CONFLICT (did) DO UPDATE
SET dname = EXCLUDED.dname || ' (formerly ' || d.dname || ')'
WHERE d.zipcode <> '21201';
-- Name a constraint directly in the statement (uses associated
-- index to arbitrate taking the DO NOTHING action)
INSERT INTO distributors (did, dname) VALUES (9, 'Antwerp Design')
ON CONFLICT ON CONSTRAINT distributors_pkey DO NOTHING;
Insert new distributor if possible; otherwise DO NOTHING. Example assumes a unique index
has been defined that constrains values appearing in the did column on a subset of rows
where the is_active Boolean column evaluates to true:
-- This statement could infer a partial unique index on "did"
-- with a predicate of "WHERE is_active", but it could also
-- just use a regular unique constraint on "did"
INSERT INTO distributors (did, dname) VALUES (10, 'Conrad International')
ON CONFLICT (did) WHERE is_active DO NOTHING;
COMPATIBILITY
INSERT conforms to the SQL standard, except that the RETURNING clause is a PostgreSQL
extension, as is the ability to use WITH with INSERT, and the ability to specify an
alternative action with ON CONFLICT. Also, the case in which a column name list is
omitted, but not all the columns are filled from the VALUES clause or query, is disallowed
by the standard.
Possible limitations of the query clause are documented under SELECT(7).